Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description discloses the GET endpoint and the paginated response shape `{ members[], next }`, adding behavioral detail beyond the readOnlyHint annotation. It does not contradict annotations and gives the agent a clear contract for pagination and return value handling.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short sentences deliver the purpose, the API endpoint, and the response shape with no filler or redundancy. The core purpose is front-loaded and every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only paginated list tool with 8 fully documented parameters and no output schema, the description provides the essential contract: endpoint, return shape, and pagination field. Combined with readOnlyHint and complete parameter descriptions, nothing critical is missing for correct invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the input schema fully documents all 8 parameters. The description adds no additional parameter-specific meaning, which is acceptable under the baseline for full schema coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: 'List the members of a group channel.' It also gives the exact API endpoint, making the operation unambiguous. This clearly distinguishes it from sibling tools like sendbird_list_group_channels, which list channels rather than members.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description clearly implies this tool is for retrieving members of a specific group channel, which provides enough context to route an agent away from channel-level or user-level list tools. It does not explicitly state when not to use it or name alternatives, but the usage context is clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.